Author: Robert Hyatt
Date: 18:42:32 03/24/02
Go up one level in this thread
On March 24, 2002 at 21:10:57, Eugene Nalimov wrote: > >We are talking about *absolute* performance, not about "nodes per MHz", right? >Right now I can buy 2.2GHz x86 system, but I believe that fastest Alpha is 1GHz. > >I just run Crafty's "bench" on my 1.13Hz notebook and got 620knps, and I think >that fastest x86 system will be faster than fastest Alpha. > >Eugene First, several mis-matches. 1. I used gcc to compile Crafty, which Tim used to compile on the alpha. So there is no compiler differences that are very significant... 2. I believe that Vincent has been saying that 64 bit processors simply don't help. This is incorrect. They help significantly. There is no technical reason why a 64 bit processor can't be clocked just as fast as a 32 bit processor. The marketing force is simply not driving the development that way _yet_. But if someone wants to make a fast 64 bit chip, and believes that they can market it to make a profit, then it will happen. 3. If you use gcc, your 1.13ghz notebook will be well off that pace, and that will put it back into the light of a relatively equal comparison since we would all be using the same compiler. I was personally far more interested in the nps per megahertz since that seemed to be the point vincent was attacking the alpha on, and the numbers don't support his argument at all... > >>I don't know the specifics about the dual, but it was only 1.5X faster. We >>later improved this a lot as the "lock" facility we used to start with was >>very slow on the alpha architecture. >> >> >> >> >>> >>>Relative to the 1.67Ghz from the K7 the alpha achieves like >>>a 102/122 x 1.667Ghz = 1.394Ghz K7 >> >> >>Show me that 600mhz K7 that can do .8M nodes per second with crafty... >> >>Then I'll be a believer, not now... >> >> >> >>> >>>In theory the 4 instructions a clock for alpha versus >>>3 instructions a clock for K7 give 33% speedup: >>> >>>1.000 Ghz + 33% = 1.333Ghz >>> >>>It achieves however 1.394Ghz >>> >>>In short i am missing the speedup for being 64 bits at all! >> >> >>Because you are looking at the wrong data.. :) >> >> >>> >>> >>> >>> >>> >>> >>> >>> >>>> >>>> >>>>>> >>>>>>>-Tom
This page took 0.01 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.